Process for the production of flexible graphite laminated packing

Abstract

The present application relates to the technical field of graphite filler production, and provides a production process of flexible graphite laminated filler, which comprises the following steps: S1, determining the thickness, density and number of layers of the flexible graphite plate according to the specified density, specified size and weight of the punching ring of the flexible graphite laminated filler; S2, bonding the flexible graphite plate layer by layer and adopting a compound machine to compound and pressurize; S3, cutting the compounded flexible graphite plate into a strip shape; S4, adopting a special punching die to punch the strip-shaped compounded flexible graphite plate into a preformed laminated filler; and S5, putting the preformed laminated filler into a special shaping die to shape, so as to obtain the flexible graphite laminated filler. Through the technical scheme of the present application, the processing efficiency is improved, the processing cost is reduced, and the consistency of the processed flexible graphite laminated filler is higher and the sealing performance is better.

Description

Technical Field

[0001] This invention relates to the field of graphite packing production technology, and more specifically, to a production process for flexible graphite laminated packing. Background Technology

[0002] Compared with ordinary molded flexible graphite packing, laminated flexible graphite packing has the advantages of high compressive strength and good dimensional control consistency. However, in related technologies, graphite sheets are generally punched into rings, then glued together and pressed into shape. The following technical defects exist: (1) low processing efficiency, difficulty in mass production, and high processing cost. (2) large density fluctuations and poor consistency of laminated flexible graphite packing products, making it difficult to meet more refined sealing requirements. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0004] Therefore, the purpose of this invention is to provide a production process for flexible graphite laminated fillers, which involves first compounding graphite sheets and then pressurizing them, followed by multi-blade punching and shaping. This process not only improves processing efficiency and reduces processing costs, but also produces flexible graphite laminated fillers with higher consistency and better sealing performance.

[0005] To achieve the above objectives, the present invention provides a production process for flexible graphite laminated fillers, comprising the following steps: S1, based on the specified specifications, specified density, and weight of the punched rings of the flexible graphite laminated filler, the thickness, density, and number of layers of the flexible graphite sheet are determined according to the following formula:

[0006]

[0007] Where, m h The weight, m, is represented by the weight of the punching ring. l Characterized by the weight of the laminated packing material, H l Characterized by the height of the stacked packing material, ρ l The density, δ, is characterized as the density of the laminated packing. b The thickness of the flexible graphite sheet is represented by N, the number of layers in the flexible graphite sheet is represented by ρ. b The density is characterized as that of flexible graphite sheets.

[0008] S2, flexible graphite sheets are bonded layer by layer and then composited under pressure using a composite machine;

[0009] S3, cut the composite flexible graphite sheet into strips;

[0010] S4 uses a special punching die to punch strips of composite flexible graphite sheets to form pre-formed laminated fillers;

[0011] S5, the pre-formed laminated filler is placed into a special shaping mold for shaping to obtain flexible graphite laminated filler.

[0012] It should be noted that the weight of the flexible graphite laminated packing is equal to the weight of the punching ring. This is used to calculate and select the flexible graphite sheet, ensuring that the density of the laminated packing after molding equals the initial design density. This guarantees that the density of the laminated packing meets design requirements and results in high product quality consistency. The punching ring is also known as the pre-formed laminated packing.

[0013] Preferably, in step S2, when using a composite pressurizing machine for composite bonding, the pressure is controlled between 2 MPa and 3.5 MPa, and the bonding amount is controlled between 0.2 mm and 0.5 mm.

[0014] Preferably, in step S4, the specially made punching die includes: a circular inner die, an annular middle die, and an annular outer die arranged from the inside out; an annular inner diameter punching cutter is disposed between the inner die and the middle die; an annular outer diameter punching cutter is disposed between the middle die and the outer die; an outer die ejector plate, a middle die ejector plate, and an inner die ejector plate are respectively disposed corresponding to the outer die, the middle die, and the inner die, and are respectively connected to the outer die, the middle die, and the inner die through an outer die ejector block, a middle die ejector block, and an inner die ejector block;

[0015] The outer mold ejection block, the middle mold ejection block, and the inner mold ejection block are connected to the interior of the outer mold, the middle mold, and the inner mold of the punching die respectively through an elastic structure. During punching, they are pressed into the interior of the mold and automatically spring back after punching to achieve material ejection.

[0016] Preferably, the height of the annular inner diameter punching cutter and the annular outer diameter punching cutter is 8-10 times the height of the stacked packing.

[0017] Preferably, both the annular inner diameter punching cutter and the annular outer diameter punching cutter are integrally formed cutters.

[0018] Preferably, the height of the inner die of the circular die, the middle die of the annular die, and the outer die of the annular die is 1 / 3 to 1 / 2 of the height of the cutting tool.

[0019] Preferably, the special punching die is designed with multiple sets of annular inner diameter punching cutters and annular outer diameter punching cutters, and is equipped with corresponding circular inner die, annular middle die, annular outer die, as well as outer die ejector plate, middle die ejector plate, and inner die ejector plate.

[0020] Preferably, in step S4, the punching pressure is controlled at 8 MPa-10 MPa, and the punching speed is controlled at 3 times / minute.

[0021] Preferably, in step S5, the specially made shaping mold includes: an inner shaping mold and an outer shaping mold arranged from the inside out; upper and lower shaping mold washers disposed between the inner shaping mold and the outer shaping mold; a shaping mold pressure ring disposed above the upper and lower shaping mold washers; and pre-formed laminated filler placed between the upper and lower shaping mold washers, which is then pressed down by the shaping mold pressure ring for shaping.

[0022] Preferably, in step S5, the shaping pressure is controlled at 7 MPa-8.5 MPa, and the shaping speed is controlled at 5 times / minute.

[0023] The flexible graphite laminated filler production process proposed in this invention has the following beneficial technical effects:

[0024] (1) The production process of flexible graphite laminated filler proposed in this invention is simple and reliable, with high processing efficiency and low processing cost. The processed flexible graphite laminated filler products have good consistency, relatively uniform density distribution, and high product quality.

[0025] (2) The production process of the flexible graphite laminated filler proposed in this invention can accurately control the density of the flexible graphite laminated filler, making its density range uniformly distributed, with the difference between the maximum and minimum density less than 0.06 g / cm³. 3 .

[0026] (3) The flexible graphite laminated packing produced by the flexible graphite laminated packing production process proposed in this invention has significantly improved its sealing performance.

[0027] (4) The flexible graphite laminated filler production process proposed in this invention controls the pressure and amount of lamination in the lamination machine, which ensures the appearance of the laminated filler and the bonding strength of the graphite plate, making it less prone to delamination.

[0028] (5) The flexible graphite laminated filler production process proposed in this invention, through unique die design and control of die pressure and speed, ensures that the pre-formed laminated filler punched from the flexible graphite composite plate is in a state of semi-connection with the composite raw material, protecting the cutting tools, further improving production efficiency, reducing costs, and resulting in higher surface quality and easier shaping of the flexible graphite laminated filler. Furthermore, the cutting tools are less prone to damage, and the material removal effect is guaranteed. Multiple sets of cutting tools can be arranged according to space constraints to further improve production efficiency.

[0029] (6) The flexible graphite laminated packing production process proposed in this invention further ensures the pass rate and sealing performance of the laminated packing through the unique shaping mold design and the control of shaping pressure and shaping speed.

[0030] Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0032] Figure 1 A schematic diagram of the specially designed punching die used in the production process of the flexible graphite laminated filler proposed in this invention is shown.

[0033] Figure 2 The diagram shows a schematic of the specially designed shaping mold used in the production process of the flexible graphite laminated filler proposed in this invention.

[0034] in, Figure 1 and Figure 2 The correspondence between the reference numerals and components in the attached drawings is as follows:

[0035] 102 Circular punch inner die, 104 Ring-shaped punch middle die, 106 Ring-shaped punch outer die, 108 Ring-shaped inner diameter punch cutter, 110 Ring-shaped outer diameter punch cutter, 112 Outer die ejector plate, 114 Middle die ejector plate, 116 Inner die ejector plate, 118 Outer die ejector block, 120 Middle die ejector block, 122 Inner die ejector block;

[0036] 202 Inner mold of shaping mold, 204 Outer mold of shaping mold, 206 Upper and lower washers of shaping mold, 208 Pressure ring of shaping mold, 210 Preformed laminated filler. Detailed Implementation

[0037] This invention discloses a production process for flexible graphite laminated fillers. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0038] The present invention will be further illustrated below with reference to the embodiments:

[0039] Example 1

[0040] A production process for flexible graphite laminated fillers, preparing specifications Layered packing, comprising the following steps:

[0041] S102, the specified specification for flexible graphite laminated filler is... The specified density is 1.7 g / cm³. 3 The weight of the punching ring is 1.28g, according to the following formula,

[0042]

[0043] Where, m h The weight, m, is represented by the weight of the punching ring. l Characterized by the weight of the laminated packing material, H l Characterized by the height of the stacked packing material, ρ l The density, δ, is characterized as the density of the laminated packing. b The thickness of the flexible graphite sheet is represented by N, the number of layers in the flexible graphite sheet is represented by ρ. b Density of flexible graphite sheets

[0044] Calculations determined that the thickness of the flexible graphite sheet was 1 mm and its density was 1.02 g / cm³. 3 The number of floors is 5.

[0045] S104 is used to bond flexible graphite sheets layer by layer, and a composite machine is used for composite pressure control at 3.0 MPa and composite amount control at 0.3 mm.

[0046] S106, cut the composite flexible graphite sheet into strips.

[0047] S108 uses a specially designed punching die to punch strips of composite flexible graphite sheets into pre-formed laminated fillers. The specially designed punching die includes... Figure 1As shown, the die includes: a circular inner die 102, an annular middle die 104, and an annular outer die 106 arranged from the inside out; an annular inner diameter cutting blade 108 disposed between the inner die and the middle die; an annular outer diameter cutting blade 110 disposed between the middle die and the outer die; and an outer die ejector plate 112, a middle die ejector plate 114, and an inner die ejector plate 116 respectively connected to the outer die, the middle die, and the inner die. Correspondingly configured, and connected to the outer die, middle die, and inner die of the punching die via the outer die ejection block 118, the middle die ejection block 120, and the inner die ejection block 122 respectively; the outer die ejection block 118, the middle die ejection block 120, and the inner die ejection block 122 are connected to the interior of the outer die, the middle die, and the inner die of the punching die via elastic structures. During punching, they are pressed into their interiors, and after punching, they automatically spring back to achieve material ejection. The height of the annular inner diameter punching cutter 108 and the annular outer diameter punching cutter 110 is 8-10 times the height of the stacked filler, and both the annular inner diameter punching cutter 108 and the annular outer diameter punching cutter 110 are integrally formed cutters. The height of the circular die inner die 102, the annular die middle die 104, and the annular die outer die 106 is 1 / 3-1 / 2 of the height of the punching cutter. In addition, the specially designed punching die can be equipped with multiple sets of annular inner diameter punching cutters 108 and annular outer diameter punching cutters 110, depending on the available space. It also includes corresponding circular inner die 102, annular middle die 104, annular outer die 106, and ejector plates 112, 114, and 116. The punching pressure is controlled at 9 MPa, and the punching speed is controlled at 3 cuts per minute.

[0048] S110, the pre-formed laminated filler is placed into a specially designed shaping mold for shaping to obtain flexible graphite laminated filler. The specially designed shaping mold includes: an inner shaping mold 202 and an outer shaping mold 204 arranged from the inside out; upper and lower shaping mold washers 206, positioned between the inner and outer shaping molds 202 and 204; and a shaping mold pressure ring 208, positioned above the upper and lower shaping mold washers 206. The pre-formed laminated filler 210 is placed between the upper and lower shaping mold washers 206 and shaped by the downward pressure of the shaping mold pressure ring 208. The shaping pressure is controlled at 8.0 MPa, and the shaping speed is controlled at 5 times / minute.

[0049] Randomly select the specifications prepared by this process Layered packings and specifications prepared by traditional processes The density of the stacked packing was tested and compared, and the results are shown in Table 1 below.

[0050] Table 1 Comparison of densities of laminated packing materials

[0051]

[0052] As shown in Table 1, the density distribution of the flexible graphite laminated filler prepared in Example 1 of this invention is very uniform, ranging from 1.619 to 1.672, while the density of the laminated filler prepared by the traditional process fluctuates significantly between 1.486 and 1.712. Therefore, the flexible graphite laminated filler production process proposed in this invention greatly improves the consistency and quality of the product.

[0053] Example 2

[0054] The difference from Example 1 lies in the preparation specifications. Layered packing,

[0055] In step S102, the specified specifications for the flexible graphite laminated filler are as follows: The specified density is 1.7 g / cm³. 3 The weight of the punching ring is 0.83g. Calculations determine the thickness of the flexible graphite sheet to be 1.0mm and its density to be 0.97g / cm³. 3 The number of floors is 7.

[0056] In step S104, the pressure is controlled at 2.5 MPa and the composite amount is controlled at 0.2 mm.

[0057] In step S108, the punching pressure is controlled at 8.5 MPa.

[0058] In step S110, the shaping pressure is controlled at 8 MPa.

[0059] Example 3

[0060] The difference from Example 1 is that the preparation specifications are as follows: Layered packing,

[0061] In step S102, the specified specifications for the flexible graphite laminated filler are as follows: The specified density is 1.6 g / cm³. 3 The weight of the punching ring is 0.66g. The thickness of the flexible graphite sheet was determined to be 1.0mm, and its density to be 1.07g / cm³. 3 The number of floors is 6.

[0062] In step S104, the pressure is controlled at 2 MPa and the composite amount is controlled at 0.2 mm.

[0063] In step S108, the punching pressure is controlled at 8 MPa.

[0064] In step S110, the shaping pressure is controlled at 8 MPa.

[0065] Example 4

[0066] The difference from Example 1 lies in the preparation specifications. Layered packing,

[0067] In step S102, the specified specifications for the flexible graphite laminated filler are as follows: The specified density is 1.7 g / cm³. 3 The weight of the punching ring is 0.50g. Calculations determine the thickness of the flexible graphite sheet to be 1.0mm and its density to be 1.02g / cm³. 3 The number of floors is 5.

[0068] In step S104, the pressure is controlled at 3.5 MPa and the composite amount is controlled at 0.5 mm.

[0069] In step S108, the punching pressure is controlled at 10 MPa.

[0070] In step S110, the shaping pressure is controlled at 8 MPa.

[0071] Example 5

[0072] The difference from Example 1 lies in the preparation specifications: Layered packing,

[0073] In step S102, the specified specifications for the flexible graphite laminated filler are as follows: The specified density is 1.7 g / cm³. 3 The weight of the punching ring is 0.42g. Calculations determine the thickness of the flexible graphite sheet to be 1.0mm and its density to be 1.02g / cm³. 3 The number of floors is 5.

[0074] In step S104, the pressure is controlled at 3.0 MPa and the composite amount is controlled at 0.4 mm.

[0075] In step S108, the punching pressure is controlled at 9.5 MPa.

[0076] In step S110, the shaping pressure is controlled at 7.5 MPa.

[0077] Samples were taken from the flexible graphite laminated packings prepared in Examples 1 to 5 and labeled as A, B, C, D, and E, respectively. At the same time, laminated packings of the same specifications prepared by conventional processes were taken as a comparison for sealing performance testing. The test results are shown in Table 2 below.

[0078] Table 2. Test results of sealing performance of flexible graphite laminated packing.

[0079]

[0080] As shown in Table 2, the sealing performance of the flexible graphite laminated packing prepared by the production process of the flexible graphite laminated packing proposed in this invention has been significantly improved.

[0081] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A production process for flexible graphite laminated fillers, characterized in that, Includes the following steps: S1. Based on the specified specifications, density, and weight of the punching ring of the flexible graphite laminated filler, determine the thickness, density, and number of layers of the flexible graphite sheet according to the following formula: ， Where, m h The weight, m, is represented by the weight of the punching ring. l Characterized by the weight of the laminated packing material, H l Characterized by the height of the stacked packing material, ρ l The density, δ, is characterized as the density of the laminated packing. b The thickness of the flexible graphite sheet is represented by N, the number of layers in the flexible graphite sheet is represented by ρ. b The density is characterized as that of flexible graphite sheets. S2, flexible graphite sheets are bonded layer by layer and then composited under pressure using a composite machine; S3, cut the composite flexible graphite sheet into strips; S4 uses a special punching die to punch strips of composite flexible graphite sheets to form pre-formed laminated fillers; The special punching die includes: a circular inner die, an annular middle die, and an annular outer die arranged from the inside out; an annular inner diameter punching cutter is disposed between the inner die and the middle die; an annular outer diameter punching cutter is disposed between the middle die and the outer die; an outer die ejector plate, a middle die ejector plate, and an inner die ejector plate are respectively disposed corresponding to the outer die, the middle die, and the inner die, and are respectively connected to the outer die, the middle die, and the inner die through an outer die ejector block, a middle die ejector block, and an inner die ejector block, respectively. The outer mold ejection block, the middle mold ejection block, and the inner mold ejection block are respectively connected to the interior of the outer mold, the middle mold, and the inner mold of the punching die through an elastic structure. During punching, they are pressed into the interior of the mold and automatically spring back after punching to achieve material ejection. S5, the pre-formed laminated filler is placed into a special shaping mold for shaping to obtain flexible graphite laminated filler.

2. The production process of flexible graphite laminated filler according to claim 1, characterized in that, In step S2, when using a composite pressurizer for composite bonding, the pressure is controlled between 2 MPa and 3.5 MPa, and the bonding amount is controlled between 0.2 mm and 0.5 mm.

3. The production process of flexible graphite laminated filler according to claim 1, characterized in that, The height of the annular inner diameter punching cutter and the annular outer diameter punching cutter is 8-10 times the height of the stacked packing.

4. The production process of flexible graphite laminated filler according to claim 1, characterized in that, Both the annular inner diameter punching cutter and the annular outer diameter punching cutter are integrally formed cutters.

5. The production process of flexible graphite laminated filler according to claim 1, characterized in that, The height of the inner die of the circular punch, the middle die of the annular punch, and the outer die of the annular punch is 1 / 3 to 1 / 2 of the height of the punching tool.

6. The production process of flexible graphite laminated filler according to claim 1, characterized in that, The specially designed punching die is designed with multiple sets of annular inner diameter punching cutters and annular outer diameter punching cutters, and is equipped with corresponding circular inner die, annular middle die, annular outer die, as well as outer die ejector plate, middle die ejector plate, and inner die ejector plate.

7. The production process of flexible graphite laminated filler according to claim 1, characterized in that, In step S4, the punching pressure is controlled at 8 MPa-10 MPa, and the punching speed is controlled at 3 times / minute.

8. The production process of flexible graphite laminated filler according to any one of claims 1 to 7, characterized in that, In step S5, the specially made shaping mold includes: an inner shaping mold and an outer shaping mold arranged from the inside out; upper and lower shaping mold washers, disposed between the inner and outer shaping molds; a shaping mold pressure ring, disposed above the upper and lower shaping mold washers; and pre-formed laminated filler placed between the upper and lower shaping mold washers, which is then pressed down by the shaping mold pressure ring for shaping.

9. The production process of flexible graphite laminated filler according to claim 8, characterized in that, In step S5, the shaping pressure is controlled at 7 MPa-8.5 MPa, and the shaping speed is controlled at 5 times / minute.

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